.content{
  max-width: 600px;
  padding: 15px;
  margin: 0 auto;
}
.box{
  width: 100%;
  height: 80px;
  background-size:cover;
  margin-bottom: 5px;
  background-color: gray;
}

.loading{
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #fff;
  text-align: center;
  padding-top: 70%;
}